Operating and Peak Pressure Drops in Conical Spouted Beds Equipped with Draft Tubes of Different Configuration

2013 ◽  
Vol 53 (1) ◽  
pp. 415-427 ◽  
Author(s):  
Haritz Altzibar ◽  
Gartzen Lopez ◽  
Javier Bilbao ◽  
Martin Olazar
Keyword(s):  
Peak Pressure ◽  
Pressure Drops ◽  
Spouted Beds ◽  
Draft Tubes

scholarly journals CFD-modeling of effects of draft tubes on operating condition in spouted beds

2013 ◽  
Vol 37 (4) ◽  
pp. 1851-1859 ◽  
Author(s):  
S. Moradi ◽  
A. Yeganeh ◽  
M. Salimi
Keyword(s):  
Cfd Modeling ◽  
Operating Condition ◽  
Spouted Beds ◽  
Draft Tubes

Minimum Spouting Velocity of Conical Spouted Beds Equipped with Draft Tubes of Different Configuration

2013 ◽  
Vol 52 (8) ◽  
pp. 2995-3006 ◽  
Author(s):  
Haritz Altzibar ◽  
Gartzen Lopez ◽  
Javier Bilbao ◽  
Martin Olazar
Keyword(s):  
Spouted Beds ◽  
Draft Tubes

scholarly journals Bed symmetry in the fountain confined conical spouted beds with open-sided draft tubes

2021 ◽  
Author(s):  
Mikel Tellabide ◽  
Idoia Estiati ◽  
Aitor Atxutegi ◽  
Haritz Altzibar ◽  
Javier Bilbao ◽  
...  
Keyword(s):  
Spouted Beds ◽  
Draft Tubes

Smart computing approach for design and scale-up of conical spouted beds with open-sided draft tubes

Particuology ◽  
2020 ◽  
Author(s):  
M. Karimi ◽  
B. Vaferi ◽  
S.H. Hosseini ◽  
M. Olazar ◽  
S. Rashidi
Keyword(s):  
Scale Up ◽  
Spouted Beds ◽  
Draft Tubes ◽  
Smart Computing ◽  
Computing Approach

Effects of Draft Tubes on Particle Velocity Profiles in Spouted Beds

2006 ◽  
Vol 29 (7) ◽  
pp. 875-881 ◽  
Author(s):  
X.-L. Zhao ◽  
Q. Yao ◽  
S.-Q. Li
Keyword(s):  
Particle Velocity ◽  
Velocity Profiles ◽  
Spouted Beds ◽  
Draft Tubes

scholarly journals Paraboloid-Based Spouted Bed Drying of Paddy: Aerodynamics, Temperature Distribution, and Moisture Degradation

2019 ◽  
Vol 1 (2) ◽  
pp. 257-264
Author(s):  
Duygu Evin
Keyword(s):  
Temperature Distribution ◽  
Moisture Content ◽  
Draft Tube ◽  
Initial Moisture Content ◽  
Spouted Bed ◽  
Drying Time ◽  
Pressure Drops ◽  
Rate Period ◽  
Drying Rates ◽  
Draft Tubes

Aerodynamics, temperature variations in the annulus, and the moisture reduction of paddy in a paraboloid-based spouted bed (PBSB) dryer without draft tube and with solid and porous draft tubes were investigated. Draft tube caused a rapid decrease in the peak pressure drop and minimum spouting velocity when compared with PBSB without a draft tube. Pressure drops with draft tubes were 17 to 30% of the values for the PBSB without a draft tube. Temperature distribution along the bed height in the annular region during drying of paddy was also investigated. Heat-up in the spouted bed without draft tube was more rapid. The experiments were conducted for 70, 90, and 110 °C inlet air temperatures. The required length of drying time to dry the paddy with an initial moisture content of 0.35 db to a moisture content below 0.15 db could be reduced by 50–60% using a temperature of 110 °C instead of 70 °C. No constant rate period was observed. Drying took place in the falling rate period. Drying time decreased in the case of porous draft tube rather than the solid one. The highest drying rates were achieved by spouted bed without draft tube. Drying rates were in the range of 0.62–0.1, 0.51–0.06, and 0.37–0.06 (db.min−1) for the spouted bed without draft tube, with porous, and solid draft tubes, respectively.

Correlations for calculating peak and spouting pressure drops in conical spouted beds of biomass

2017 ◽  
Vol 80 ◽  
pp. 678-685 ◽  
Author(s):  
Juan F. Saldarriaga ◽  
Aitor Atxutegi ◽  
Roberto Aguado ◽  
Haritz Altzibar ◽  
Javier Bilbao ◽  
...  
Keyword(s):  
Pressure Drops ◽  
Spouted Beds

Particle Cycle Times and Solid Circulation Rates in Conical Spouted Beds with Draft Tubes of Different Configuration

2013 ◽  
Vol 52 (45) ◽  
pp. 15959-15967 ◽  
Author(s):  
H. Altzibar ◽  
G. Lopez ◽  
I. Estiati ◽  
J. Bilbao ◽  
M. Olazar
Keyword(s):  
Cycle Times ◽  
Spouted Beds ◽  
Draft Tubes

CFD Multifluid Simulation of Spouted Beds with and without Internal Draft Tubes

2011 ◽  
Vol 6 (1) ◽  
Author(s):  
Mahmood Reza Rahimi ◽  
Salar Azizi
Keyword(s):  
Experimental Data ◽  
Particle Trajectory ◽  
Draft Tube ◽  
Granular Flows ◽  
Spouted Bed ◽  
Drag Model ◽  
Spouted Beds ◽  
Particulate Solids ◽  
Computational Fluid Dynamics Cfd ◽  
Draft Tubes

The insertion of an axially positioned non-porous and porous draft tube into the conventional spouted bed has shown potential advantages in stability and flexibility of the system and controlling particle trajectory history. In this work with computational fluid dynamics (CFD), important information on the flow field within three types of spouted bed has been provided and influences of using internal tube on spouted beds hydrodynamics were investigated. The simulation used the multi-fluid Eulerian-Eulerian approach based on kinetic theory of granular flows (KTGF), incorporating a kinetic-frictional constitutive model for dense assemblies of particulate solids and Gidaspow’s drag model for the interaction between gas and particles. Finally, the modeling results were compared with the experimental data from literature.

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